Door and hoisting mechanism therefor



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A. T. PRESCOTT. Doon AND HQISTING MECHANISM THEREFOR.

APPLICATION FILED APH.13. 1916.

Patented Oct. MD, 11922..

4 SHEETS-SHEET l. P- i i-| l* MUMLFOZ SH01 nel A. T. PRESCOTT.

D001 AND HolsTlNG MECHANISM THEREFOR.

MPLICATION FILED APR. I3, 1916. Patented Oct. M1, @22

4 SHEETS-SHEET 3.

Fig-.7. l fm Figi/ y A, T. PRESCOTT.

-DUOR AND HOISTING MECHANISM THEREFOR. 'APPLacATIoN man APR.13,1916.

1,43 l, l 8 1 Patented Oct. l0, 1922-..

4 SHEETS-SHEET 4.

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AJR'IHTJ'R T. FRESCOTT, EAST ORANGE,

NEW JERSEY, ASSIGNOR T- G'EORGE E. FROTHINGHAM COMPANY, vOF NEW YORK, N. Y., CORPORATION 0F NEW YORK.

DOOR AND HOISTING: MEGHANISM THEREFORE.

' application aiea apirii i3,

To all whom t may concern:

Be it known that I, ARTHUR T. PREsoo'rT, a citizen of the United States, and a resident of East Orange, county-of Essex, and State of .NewJersey, have invented certain new and' useful Improvements in Doors and Hoisting Mechanisms Therefor, of which the follow-ing is a specification, reference being had to the accompanying drawings,

forming a part thereof. My invention relates to doors and has special reference to large, heavy doors for pier sheds, factories, .and the like, which are arranged to swing in opening, from a vertical plane to a substantially horizontal or an inclined plane above the door-opening. One object of my invention is to provide a. simple and vdurable door opening mechanism that shall be arranged not only to hoist the door by an upwardpull but also to exert a pull on the door near itsupper end, to break it in and assist in swinging it both from and towards the door casing.

Another object is to provide .a door opening mechanism adapted to exert forces tending to open the door and applied thereto at points which move at varying speeds.

Another object is to, provide an operating" mechanism for swinging doors, comprising a hoisting chain, a chain for pulling the top v ot the door away from or towards the casing, means such as a pocket sheave for actuating each chain, a driving means such as a hand chain, and a differential, compensating or lost motion mechanism for pro-A (lucing a continuous pull on each chain when the operating mechanism is actuated although the chains 'are so -connected to the door that they may be forced to move at unlike speeds or one may be held stationary while the other continues its motion.

Another object is to provide means for exertinga positive pull upon the door near the top for both breaking in the door in opening and holding it tightly against thev casing when it is closed. l

Another object is to provide a multi-section door, that is a door with two or more sections, having means for latching the door closed at the top, means for latching the door sections together when they are over-l lapped, hoisting and actuating .chains `for opening the door, and differential gearing adapted to exert continuous pulls on both 191e. semi in. eaaea.

chains while permitting the lower door section to lbe moved upwardly independently of the upper and locked thereto and both sections to beswungfrom the vertical to a substantially horizontal o r an inclined plane.

Other objects of my invention will be set forth hereinafter, and in order that my invention may be thoroughly understood I will now proceed to describe the same in the following specification and then point out the novel features thereofl in appended.

claims.,

,Referring to the drawings: Figure l is a front elevation of a two section door whichl is arranged and constructed 1n. accordance with my invention and con.- stitutes an embodiment thereof.

Figure 2y is a sectional elevation, taken on the line 2-2 of Figure l. A

Figure 3 is a partial section corresponding to Figure 2 but showing thedoor in its open position. l

Figure 4 is a sectional `elevation on 'the linea- 4 of Figure 1 drawn toa larger scale.

Figure 5 is another sectional elevation, taken on the line 5 5 of Figure 1.

A plan View of the same parts is shown in Figure 6.

Figure 7 is a sectional plan view of the hoisting mechanism of thedoor, drawn to a larger scale.

Figure 8 is an end elevation of the saine mechanism.

Figures 9 and 10 are sectional plans taken respectively on the lines 9 9 and 10-10 of Figure 1.

Figures 11, 12 and 13 are detail views showing parts of the structure of the previous figures. v

Figures 14e and 15 are diagrammatic views corresponding to Figure 2, of modiied door structures which also constitute embodiments of my invention.

The slip gear or sheave of. Figure 15 is and 13).

the door is suspended from brackets 25 above the door opening by links 26 which are connected to the guideways 24 on the upper door section.

lllhe upper door sec-tion is pro-vided with a rlatch 27 which, when the upper section is closed, is held in a release posit-ion, by engaging with the lintel which holds it in opposition to a spring 28 (see Figures 11, 12 On the upper edge of the lower section is a catch or lug which is adapted to cooperate with the latch, the door sections being locked together by this means when they are overlapped andwhen the latch is disengaged from the lintel by the inward movement of the upper door section away from the casing.

Pivotally mounted on the lintel is a lock 29 `which is arranged to cooperate with an upwardly extending pin or projection 30 on the upper edge of the upper door section and to extend into the path of the lower section which is provided with a projection 31 to release the lock.

rllhe door opening mechanism comprises a transverse shaft 32 abovethe door opening, having a pair of spaced pocket sheaves 33 and 34 secured thereto near its ends. `(lo-operating with these pocket sheaves are hoisting chains 37 and 38 which are attached to projections 39 at the lower' corners of the lower. door sec-tion, extend over the pocket sheaves and guide pulleys, and support, at: their opposite ends, counterweights 40. A differential gearing 41 is located near the pocket sheave 34.

A sleeve or hollow shaft 42 is mounted on lthe shaft 32 and carries a pocket sheave or sprocket wheel 43 near the central plane of the door, and is coupled to a gear wheel 44 which forms a part of the differential gearupper door section 18.

The differential gearing comprises a disc 52 which is keyed to the shaft 32, a pair of pinions 53, and a gear wheel 54 in addition to the gear 44.

Manier The pinions 53 are on opposite sides of and mesh with the crear wheel 44 which is coupled to the hollow shaft 42 and are mounted on studs 55 of the disc 52.

rlfhey also mesh with the gear wheel 54 which is internally toothed to cooperate therewith.

lhe gear wheel 54 isalso externally toothed and is driven by a pinion 56 which is operatively connected by gears 57 and 58 to a shaft 59 to which a pocket sheave 60 is secured. The mechanism is actuated by a hand chain 61 suspended from the pocket sheave 60. s

The diiferential gearing above described in itself forms no part of my present invention and other well known differential gear structures may be employed.

The operation o the invention is as fol lows: Assuming that the door is closed as shown in Figures 1 and 2, the lock 29 being active and holding the top of the door sec tion against the casing, if the hand chain is operated to raise the lower door section, the shaft 59 and the pinion 58 are rotated producing a rotation of the gear wheel 54 of the differential gearing. This rotation produces a rotation of the pinions 53 which tends to drive the gear wheel 44 and the disc 52 together with theshafts 42 and 32 to which they are respectively secured. 'lhe shaft 32 is free to turn a-nd is consequently rotated together with the pocket sheaves 33 and 34 secured thereto. T he lower door section is thus elevated, and the counterweights 40 correspondingly lowered. However, the hollow shaft 42 cannot turn because the upper door section is held by the lock 29 and cannot be swung outwardly from the casmg.

The differential gearing, however, puts a tension in the chains 47 and 49 which tends to throw the upper end of the upper door section away from the casing.

When the lower door section finally overlaps the upper section, the projection 3l at its upper edge releases the lock-29 and the tension in the chains-i7 and 49causes the door to swing away from thecasing. Thus, the tension serves as a very effective means for breaking in the door at the top. 'l

As the loc-k is released, the latch 27 en.- gages the lug or catch 65 on the lower door .section locking the two sections together.

The hollow shaft 42 is now free to turn as well as the shaft 32 and consequently/both are turned andconsequently both tlieilioisting chains 37 and ,38 and the chains 47 and 49 are active. The hoisting chains elevate the lower end of the door which is now guided by the rollers 23 cooperating with the guideways 22 while the chains 47 and 49 pull the upper end of the door away from the casing.

Although the hollow shaft is released and insider lend of the door first travels faster than the lower end and afterward travels slower than the lower end. Thisis evident from the fact that the inital movement is comparable to an outward swinging of the upper end about the lower end as al pivot while the final opening movement Ais comparable to the upward swinging of the lower end about the upper end as a pivot.

By the use of the differential gearing l am able to produce a constant pull on the door, both at the top and at the bottom, one pull tending to hoist and the other tending to move the top of the door away 'from the casing, although the forces are applied to the door at different points which travel at unlike speeds and without interfering with the initial independent movement of the lower section as it slides upon the upper.

In closing, the hand chain is opera-ted in the-reverse direction and the upper end of the door is pulled in against the casing while the counterwei hts are raised, permitting the lower end of the door to de-- scend. The lower door section tends to slide away from the upper but is held in place by the latch 27.

When the upper section engages the casing, the latch 27 is released and the projection 30 is in position to be engaged by the lock 29 although the lock is held up by the projection 31cof the lower section.

A continued actuation of the hand chain in the same direction after the upper sec- 4duces a tension on the chains 47 and 49 which tightly pulls the upper section against the casing and holds it there. rllhe shaft 32 however, is free to turn and the counterweights are elevated, permitting the lower section to descend independently of the upper section.

When the lower section has descended a short distance, the vlock 29 engages pin 80.

My invention is very well adapted for multi-section doors, but is by no means limited in this regard. y v

Instead of the differential gearing which forms a part of the structure above de scribed, other suitable means may be employed for compensating for the difference 1n s eed betweenthe top of the door and the ottom of the door and for permitting the independent movement of the lower door section lin case the door comprises more than one section. in order to indicate the scope of my invention, l have shown modified structures in Figures 14 to 17 to which reference may` now he had.

In Figure 14, designates the lintel of the door which comprises an upper section 71 and a lower section 72 ;y 73 and 74' are 'hoistingchain or cable 82 connected guide pulleys, 75 is a Hoa-ting sheave, 76 a oor opening mechanism', 77 a hand chain and 78 and 79 counterweights.

' A chain 80 is attached to the bottom section 73 at its lower end as indicated at 81 and extends upwardly over the guide pulleys 73 around the float-ing sheave 75, to the top of the upper door section where it is secured at 82.

Another chain section 83 extends from 82 over the guide pulley 74 to the counterweight 79. The counterweight 78 is suspended by a chain 84 which extends over a pocket sheave 86 of the door opening mechanism and is connected at its opposite end to a yoke 85 in which the floating sheave 7 5 is mounted.

The operating mechanism in addition to the pocket sheave 86 comprises gearing 87 and a pocket sheave 88 with which the hand chain 7 7 cooperates.

The operation of this modification is as "follows: Assuming that the door is closed as shown in Figure 14, that the hand chain 77 is actuated to lower the counterweight and pull in on the chain 84, theflloating sheave 75 will ap roach the operating mechanism, and assuming that the upper door section 71 is locked as in the structure ot the previous figures, the lower section 72 moves upwardly and atension is exerted on a section 8OEL of the chain 8O tending to open the door at the top.

lWhcn the lower section overlaps the upper section and releasesthe lock, the continued action ot the hand chain produces a pull on the top as well as on the bottom of the door causing the door to break in at the top and swing into its open position.

rihe difference in speed between the top and bottoni is automatically compensated for by the floatingsheave 7 5, which permits chain sections and 8Oa to adjust themselves.

^#titer the top of the door is released, the counterweight 79 is elevated and tends to pull the door closed. The counterweiglit 7 8 is, however, heavier and substantially balances the counterweight 79 and the door.

in closing the door, the hand chain is operated in the reverse direction so as to elevate the counterweight 78. The counteru weight 79 now serves to pull the door closed and the weight of the door, of course assists in this action. After the upper is closed against the casing, the we the lower section keeps the cable 80 in tension and the section is lowered as the counterweight'7 8 is raised.

The modification of Figure 15 corresponds quite closely in general arrangement to the structure of Figures 2 and 3. lit comprises a door opening mechanism. 89 having an actuating chain 90, a pocket sheave 91, a to the Cri lovver door section 72, extending over theand corresponds to lie sheave L18.

he slip driving' pulley 96 is operatively connected in any suitable Wav to the door opening mechanism Y rllie slip-pulley is shown iii section in Figure 16 and comprises a disc98 having a huh 99 keyed to a driven shalt 100, a dise 101 and a rim member 102 having an inwardly extending, annular projection 108 which is clamped between the discs 98 and 101 loy bolts 1041 having spring Washers 105.

The arrangment ot parts is such that the slieave Will transmit predetermined amount o1' power, lout it the load or resistance ei;- ceeds a certain amount, the rim Will slip relative to the huh. Y

The operation of this arrangement is as follows: Assuming the upper section l1 is locked at the top and the hand chain 90 is operated to open the door, the lower section ".72 is raised 1nd the counteru'eight lowered. lit 'the same time, the door openmeclianism 89 transmits povver to the sliait 100 o1 the sheave 96 and thus produces a tension in the chain 9a tending' to open the door. els soon as the upper section is released and is tree to move, the power is transmitted through the slip pulley 96 and the door is pulled inwardly at the top as vvell hoisted loy the chain 92 which is connected to the lower end.

The operative connection established loetvfeen the mechanism 89 and the slip pulley 96 suoli as to drive the top oil tliedoor at maximum speed required in opening and consequently 'there will ne cert-ain slipping1 ot the pulley to compensate-'lor tlie speed variations hereinetore described.

ln Figure 17, il have slioivii still another modification which is hetter adapted tor one piece doors. rllliis arrangement comprises an opening mechanism 10d, a hand chain 107, a counteriv ight 1,09 -which is suspended from pocket slieave 109 a chain 110, the opposite end the cl heine` connected to o1 the door as indicated at 111.

" -sorted on the idler pul nove the door openino' mnd to the idler 9'? of Figure 15.

'lie chain 1.1;?J nas pair ol resilient sections 115 and 116. assuming that the door is closed ivlien the hand chain 107 is actuated, the counterrveight 108 is lowered and J1 1 V71 v v v w Y Y trie door raised. rheie are tvfo pulls exerted the door: Cine, on the hottoin and one 'he too, the 'torce-s acting" at angle to a reen-isi each other so that one breaks in the door at the top and assists in pulling it open, While the other elevates the lower end which is guided vertically in a ivell known manner.

As hereinbetore explained, the top ot the door does not travel at constant speed or at the same speed as the bottom ot' the door and While the driving,` slieave 114 is connected to the saine mechanism 106 which eX- erts an upward pull at the bottom of the door, the springs 115 and 116 compensate for this difference in speed.

Various other modications may loe el- 'fected within the spirit and scope oi my invention, and intend that only suoli liinitations be imposed as indicated in the appended claims.

lllhat claim is:

1. rl'he combination with a door arranged to swing,` out ot a vertical closed position to a non-vertical open position above the door opening, ot a door hoistingconnection acting in the plane ot the door opening, a connection for moving the top of the door from and towards the plane oit the opening, said connections having different rates ot movement and including means tor compensating for Athe dillerence in movement ot the connections and means lor actuating said connections 2. rllhe combination with a door arranged to swing out oi a vertical'closed position to a non-vertical position above the door opening, ot' a hoisting chain acting in the plane ot' the door opening at one' rate ot movement, a chain arranged to move the top of the door trom and towards plane oit the opening at another rate ot movenient,'ineans between the chains tor moving` them at dit# lerent rates ot speed including mechanism Jor compensating tor the diiflerences in the movement ot the chains and means tor actuating; said means.

3. rl`he combination with a door arranged to swing out ot a. vertical closed position to a. non-vertical open position above the door opening, ot a hoistinpg'- chain actii'ipP in the plane ol the door opening' at one rate oie movement, a chain arranged to move the top ot the door from and towards the plane ot the opening at another rate ot' movement, and a single means lor movingI the tvvo chains, includingr gearinglor compensating for the dillerence in movement of the two chains, and means tor actuating said single means.

11. The combination With a door arranged to swing out ot vertical closed position 4to a non-vertical open position above the to swing out of a vertical closed position to a non-vertical open position above the door opening, of a positively actuated hoisting mechanism connected to the door at the bottom, means for exerting a substantially horizontal pull at the top of the door to move it to and from the casing, and an interposed connection between the hoisting mechanism and said means, whereby said means is driven.

6. The combination with afdoor casing com- A prising side posts and a lintel defining the door opening, of a door comprising an upper section, means for suspending the upper section to permit it to swing out of a vertical closed position to a non-vertical open position above the door opening, a lower door section arranged to overlap the upper section and cooperate therewith, hoisting means connected with the lower partof the' lower door section, other means connected with the upper dcor section arranged to exert a lateral pull upon the door sections at the top thereof for both opening and closing the door, including means for compensating for the difference 1n movement between the points of connection of said hoisting means and said other means while the two sections are moving together, a latch on the upper section arranged to be engaged by the lintel and released by the closing of the upper section'a'gainst the casing, for locking the sections together when they are overlapped, and means for actuating said latch by'- the top of the door sections swinging away from the casing.

7 The combination with a door arranged te swing out of a vertical closed position to 'a noneverti'cal open position above the door opening and comprising a plurality of sections, a latch near the top of the upper door section arranged to be released by the closing of the upper door section, a cooperating fastener on the lower section arranged to be 'engaged by the latch when the door sections are overlapped and the top is swung away from the casing, and means for actuating said latch by the top of the door sections swinging away from'the casing.

8. The combination with a door casing comprising side posts and a lintel defining the door opening, of a door comprising'a'n upper section, means for suspending the upper section to permit it to swing out of the `vertical closed position to a non-vertical open position above the door opening, a lower door section arranged to overlap the upper section and cooperate therewith, means arranged to be released by the closing of the upper section against the casing, for locking the sections together when they are overlapped, and means 'for actuating said latch by the top of the door sections swinging away from the casing.

9. The combination with a door casing comprising side posts and a lintel defining the door opening, of a door comprising an upper section, means for suspending the upper section to permit it to swing out of a vertical closed position to a non-vertical open position, above the door opening, a lower door section arranged to overlap the lupper section and cooperate therewith, a

latch on the upper lsection arranged to he engaged by the lintel and released by the closing of the upper section against the casing, for locking the sections together when they are overlapped, and means for actuating said latch by the top of the door sections swinging 'away from the casing.

10. The combination with a door arranged to swing out ,of a vertical closed position to a non-vertical position above the door opening, of a hoisting element acting in the plane of the door opening at one rate of movement, an element arranged to move the top of the door from and towards the plane of the opening at another rate of movement, means between the elements for moving them at different rates of speed including mechanism for compensating forv the differences in the movement of the elements and means for actuating said means.

l1. Thecombination with a door arranged to swing out of a vertical closed position to a non-vertical open position above the door opening, of a hoisting element acting in the plane of the door opening at one rate of movement, an element arranged to move the top of the door from and towards the plane ofthe opening at another rate-of movement,

and a single means for moving the two elements including gearing for compensating for the dilference in movement of., the two element s, andwmeans for actuating said single means. f

In witness whereof, I have hereunto set my'.- hand this 24th day of March, 1916.

yARTHUR T. Pnascorr. 

